title: Sympathetically induced spontaneous fluctuations of the photoplethysmographic signal.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology; D001810:Blood Volume / Q000502:physiology*; D005385:Fingers / Q000098:blood supply; D006706:Homeostasis / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D017156:Photoplethysmography; D011674:Pulse; D013564:Sympathetic Nervous System / Q000502:physiology*; D014034:Toes / Q000098:blood supply